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English definition of “attrition”

attrition

noun [U] uk   /əˈtrɪʃ.ən/ us  
formal gradually making something weaker and destroying it, especially the strength or confidence of an enemy by repeatedly attacking it: Terrorist groups and the government have been engaged in a costly war of attrition since 2008.Becoming and making less strong US for natural wastageRetiring and resigning from work
(Definition of attrition from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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